Deck 16: Expansion Processes

Question 1

Large slabs or blocks of flexible polyurethanes are cast in open and closed molds and cut into slabs for _____.

A) flotation material in boats
B) coatings on fabrics
C) mattress stock
D) insulation in rail cars

Answer 1

C

Question 2

Reaction injection molding (RIM) creates products that are greatly improved in terms of stability by the addition of ____.  

A) colorants
B) reinforcements
C) blowing agents
D) expansion agents

Answer 2

B

Question 3

Cellular plastics with an integral skin are known as ____.     

A) sandwich composites
B) structural foam
C) expanded plastics
D) syntactic plastics

Answer 3

B

Question 4

Extruded polyvinyl materials, which may be expanded as they emerge from the die or stored for future expansion, are often used in the ____ industry. 

A) refrigeration
B) transportation
C) automotive
D) garment

Question 5

Fillers that are added to artificial turf products to prevent matting are usually ____ or olefin.  

A) nylon
B) polyester
C) polypropylene
D) structural foam

Question 6

The ____ properties of cellular materials are particularly useful in food containers like this coffee cup.   

A) leaching
B) conductive
C) cryogenic
D) insulating

Question 7

In ____ processing, the heated melt is forced into the mold with pressures of 30 to 140 MPa.      

A) high-pressure
B) steam chamber
C) extrusion
D) low-pressure

Question 8

Vinyl esters, urea-formaldehyde (UF), phenolics, polyesters, and some dispersion polymers are made cellular by utilizing ____ methods.

A) mechanical
B) microballoon
C) vaporization
D) blowing

Question 9

An expanded plastics is similar to a sponge, bread, or whipped cream because all are ____ in structure.   

A) closed cell
B) cellular
C) dense
D) open cell

Question 10

The most popular and economical method used for large parts is ____.

A) high-pressure processing
B) steam chamber
C) low-pressure processing
D) dri-electric molding

Question 11

In one of the processes of high-pressure processing, what is represented by the letter "B"?  

A) hopper
B) reciprocating screw
C) expanded part
D) split mold

Question 12

In molding, which part is represented by "A"? 

A) cellular core
B) expanded phase
C) solid skin
D) collapsing bubbles

Question 13

What type of product is made by blending microscopically small hollow balls of glass or plastics in a resin matrix binder?

A) syntactic plastics
B) Styrofoam
C) sandwich composites
D) structural foam

Question 14

A product formed by expanding in place, in which the expanded plastics and the mold together become the finished product is a(n) ____.    

A) refrigerator door
B) Styrofoam cup
C) artificial turf
D) flotation device

Question 15

What product is commonly produced in the form of small beads containing an expanding agent which are preheated before placing them in the mold?

A) polyethylene
B) polyester
C) polystyrene
D) polypropylene

Question 16

Dielectric molding makes use of ____ to expand beads. 

A) electric current
B) steam lines
C) high-frequency radio energy
D) external heat

Question 17

Astroturf consists of a foamed ___ pad beneath the turf. 

A) PVC
B) ABS
C) polyester
D) acrylic

Question 18

What method for turning resins into expanded plastics involves forcing pentanes, hexanes, halocarbons, or moistures of these materials into the plastics particles under pressure?

A) liquid vaporization
B) whipping air into the resin and rapidly curing or cooling
C) dissolving a gas that expands at room temperature
D) thermal breakdown of a chemical blowing agent

Question 19

Polyurethanes, polyethers, urea-formaldehyde, polyvinyls, and phenolics are often processed by ____.

A) high-frequency radio energy
B) electric current
C) dielectric molding
D) cast expansion

Question 20

In one of the processes of high-pressure processing, what is represented by the letter "A"?  

A) hopper
B) reciprocating screw
C) expanded part
D) split mold